Random post order

Hey Gang!
I just need a bit of PHP help. On my site PSHERO.com I’d like to be able to randomize the order in which posts are displayed. That way visitors to my homepage will be presented with lessons that maybe they haven’t seen before. I’m crap at writing my own PHP and have searched all over for a code snippet that would do the trick but to no avail. I’m sure this isn’t rocket science, all I want to do is randomize the posts.

Thanks in advance!